This final thesis deals with the management of a joint-stock company in the Republic of Croatia, with the special emphasis on the single board system of the corporate body. The organization of the mandatory bodies of a joint-stock company is one of the most important issues of the management and is equally important to both economic and legal experts. This final thesis introduces the notion of a joint-stock company, primarily in the context of the Companies Act, which legally regulates the formation of a joint-stock company, legal relations of the company with its shareholders, mandatory bodies of the company, status changes and the ways in which company ceases to exist. Since all EU member countries are required to incorporate the European Union acquis into their national legislature, single board system was introduced into Croatian legal system, and all important changes regarding join-stock company management are presented in this final thesis. Single board and dual board systems are compared and then mandatory bodies in single board system are explained in a greater detail. The reasons of insufficient representation of single board systems in Croatia are presented and corporate management of the joint-stock company Jadran-Galenski laboratorij is presented in order to compare the theory with the practice. The aim of this final thesis is to present the single board system of a join-stock company management, to analyse its organization and compare it to the dual board system in order to confirm or deny the basic hypothesis that the single board management system is more suitable for business practice because of its flexibility and faster decision-making process.